This is Ziko, Peter is away for the next couple of days. It is very difficult to try and diagnose the problem without being able to recreate it. I would suggest sending the unit to us so we can see if we can recreate the problem (even though you say it has worked on an earlier version), if you could email us at firstname.lastname@example.org
we can take this further.
When you email us I would also like you to try the and find following files:
Check what the File version number is for these files by right clicking and choosing properties.